793
FNCA52 TJSJ 091930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST SAT MAY 9 2026
DISCUSSION
RAIN-FREE CONDITIONS HAVE PREVAILED ACROSS THE SOUTHERN SECTIONS
OF PUERTO RICO SO FAR TODAY, AND A DRIER AIR MASS OVER THE REGION
IS ALLOWING RELATIVE HUMIDITY VALUES TO DROP TO CRITICAL FIRE
WEATHER THRESHOLDS. THE CABO ROJO AND CAMP SANTIAGO RAWS STATIONS
HAVE BEEN REGISTERING RELATIVE HUMIDITY VALUES IN THE UPPER 40S
TO LOW 50S, ALONG WITH BREEZY CONDITIONS. ALSO, KBDI INDEX VALUES
REMAIN ELEVATED, PARTICULARLY IN CABO ROJO. THEREFORE, CONDITIONS
REMAIN FAVORABLE FOR THE SPREAD OF WILDFIRES ACROSS THE SOUTHERN
COASTAL PLAINS OF PUERTO RICO.
FIRE PARTNERS ARE ENCOURAGED TO REMAIN VIGILANT, AS SIMILAR
CONDITIONS ARE LIKELY TO PERSIST OVER THE COMING DAYS. THE
ISSUANCE OF A FIRE DANGER STATEMENT (RFDSJU) CANNOT BE RULED OUT.
PRZ014-100800-
SOUTHEAST COASTAL PLAINS-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 30 50
TEMP (24H TREND) 72 (-1) 89 (+1) 72 90
RH % (24H TREND) 89 (+2) 55 (-1) 91 54
WIND 20FT/EARLY(MPH) E 14 E 17 E 13 E 17
WIND 20FT/LATE(MPH) NE 14 E 17 NE 13 E 17
MIXING HGT(FT-AGL/MSL) 5610 5470
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 84150 87520
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-100800-
SOUTHERN HILLS-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10 20
TEMP (24H TREND) 68 (-2) 86 (+3) 68 87
RH % (24H TREND) 95 (+5) 61 (0) 97 59
WIND 20FT/EARLY(MPH) E 14 E 14 E 12 E 13
WIND 20FT/LATE(MPH) E 14 E 14 E 13 E 13
MIXING HGT(FT-AGL/MSL) 6360 6090
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 89040 91350
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-100800-
NORTH COASTAL PLAINS-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 20 30
TEMP (24H TREND) 72 (-1) 90 (+2) 72 90
RH % (24H TREND) 94 (+4) 57 (-3) 96 56
WIND 20FT/EARLY(MPH) E 20 E 14 E 19 E 17
WIND 20FT/LATE(MPH) E 14 E 20 E 13 E 19
MIXING HGT(FT-AGL/MSL) 6030 5300
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 90450 84800
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-100800-
NORTHERN HILLS-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 20 0 30
TEMP (24H TREND) 69 (-2) 88 (+2) 69 89
RH % (24H TREND) 95 (+3) 58 (-2) 96 56
WIND 20FT/EARLY(MPH) E 18 E 13 E 17 E 14
WIND 20FT/LATE(MPH) E 12 E 18 E 11 E 17
MIXING HGT(FT-AGL/MSL) 7250 6370
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 79750 82810
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-100800-
WEST COAST-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 30 0 30
TEMP (24H TREND) 71 (-1) 91 (+1) 71 91
RH % (24H TREND) 93 (+1) 57 (-2) 95 56
WIND 20FT/EARLY(MPH) E 18 E 14 E 13 E 13
WIND 20FT/LATE(MPH) E 14 E 16 E 12 E 16
MIXING HGT(FT-AGL/MSL) 5550 5700
TRANSPORT WND (MPH) E 13 E 12
VENT RATE (KT-FT) 61050 57000
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-100800-
EASTERN INTERIOR-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 40 50
TEMP (24H TREND) 69 (-3) 87 (+2) 69 88
RH % (24H TREND) 95 (+4) 62 (+1) 98 60
WIND 20FT/EARLY(MPH) E 16 E 14 E 13 E 16
WIND 20FT/LATE(MPH) E 14 E 14 E 14 E 14
MIXING HGT(FT-AGL/MSL) 6320 6350
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 94800 101600
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-100800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 40 50
TEMP (24H TREND) 68 (-2) 82 (+3) 68 82
RH % (24H TREND) 98 (+4) 69 (-1) 99 68
WIND 20FT/EARLY(MPH) E 12 E 13 E 10 E 13
WIND 20FT/LATE(MPH) E 12 E 13 E 11 E 13
MIXING HGT(FT-AGL/MSL) 5130 4630
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 82080 78710
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-100800-
CENTRAL MOUNTAIN RANGE-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 30 0 30
TEMP (24H TREND) 66 (-2) 87 (+5) 66 88
RH % (24H TREND) 97 (+4) 61 (-1) 97 59
WIND 20FT/EARLY(MPH) E 13 E 11 E 10 E 10
WIND 20FT/LATE(MPH) E 11 E 11 E 9 E 10
MIXING HGT(FT-AGL/MSL) 7880 6970
TRANSPORT WND (MPH) SE 10 E 14
VENT RATE (KT-FT) 70920 83640
DISPERSION 5 5
DSI 3 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-100800-
CAYEY MOUNTAIN RANGE-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 40 50
TEMP (24H TREND) 68 (-2) 82 (+2) 68 83
RH % (24H TREND) 97 (+3) 68 (+2) 100 67
WIND 20FT/EARLY(MPH) E 12 E 12 E 10 E 12
WIND 20FT/LATE(MPH) E 12 E 12 E 11 E 12
MIXING HGT(FT-AGL/MSL) 5540 5400
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 83100 86400
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-100800-
VIEQUES-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 40 50
TEMP (24H TREND) 74 (-2) 87 (+1) 74 87
RH % (24H TREND) 89 (+4) 62 (0) 90 62
WIND 20FT/EARLY(MPH) E 19 E 17 E 18 E 18
WIND 20FT/LATE(MPH) E 19 E 16 E 17 E 17
MIXING HGT(FT-AGL/MSL) 3830 3560
TRANSPORT WND (MPH) E 22 E 22
VENT RATE (KT-FT) 72770 67640
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-100800-
CULEBRA-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 40 50
TEMP (24H TREND) 76 (-1) 89 (+2) 76 89
RH % (24H TREND) 87 (+3) 60 (-3) 89 60
WIND 20FT/EARLY(MPH) E 19 E 17 E 18 E 18
WIND 20FT/LATE(MPH) E 19 E 16 E 17 E 17
MIXING HGT(FT-AGL/MSL) 3970 3500
TRANSPORT WND (MPH) E 23 E 22
VENT RATE (KT-FT) 79400 66500
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-100800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 20 0 10
TEMP (24H TREND) 72 (-1) 91 (+2) 72 91
RH % (24H TREND) 88 (+3) 54 (-1) 90 52
WIND 20FT/EARLY(MPH) E 16 E 20 E 16 E 19
WIND 20FT/LATE(MPH) E 11 SE 21 E 14 SE 21
MIXING HGT(FT-AGL/MSL) 5550 5800
TRANSPORT WND (MPH) E 22 E 20
VENT RATE (KT-FT) 105450 98600
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-100800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 40 20
TEMP (24H TREND) 75 (-2) 86 (+1) 75 86
RH % (24H TREND) 89 (+7) 63 (0) 91 62
WIND 20FT/EARLY(MPH) E 19 E 18 E 18 E 18
WIND 20FT/LATE(MPH) E 19 E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3970 3630
TRANSPORT WND (MPH) E 23 E 21
VENT RATE (KT-FT) 79400 65340
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-100800-
ST CROIX-
330 PM AST SAT MAY 9 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 40 50
TEMP (24H TREND) 73 (-3) 87 (+1) 74 87
RH % (24H TREND) 91 (+6) 63 (0) 92 63
WIND 20FT/EARLY(MPH) E 18 E 17 E 17 E 17
WIND 20FT/LATE(MPH) E 18 E 16 E 17 E 17
MIXING HGT(FT-AGL/MSL) 4610 4820
TRANSPORT WND (MPH) E 22 E 22
VENT RATE (KT-FT) 87590 91580
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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